Coating surfaces with cellulose varnishes



Oct. 21, 1930. E. RICHTER ET! AL 1,778,813"

COATING SURFACES WITH GELLULOSE VARNISHES Filed Sept. 11,' 1928 ERICI-I RICHTER, or WOLFEN,

Patented Oct. 21, 1930 i UNITED STATES v KREIS BITTERFELD, AND WALTER BECKER, OF LEIPZIG, I GERMANY, ASSIGNORS TO I. G. FARBENINDUSTRIE AKTIENGESELLSCHA'FT, OF FRANKFORT-ON THE-MAIN, GERMANY, A

CORPORATION OF GERMANY COATING SURFACES WITH CELLULOSE VARNISHES Application filed September 11,1928, Serial No. 305,316, and in Germany August 24, 1927.

Ezram-ple Q,.-8 parts by weight of cellu- The present invention relates to improve, ments in coating surfaces with cellulose varnishes and for facilitating the application of more than one coating of cellulose varnish.

According to this invention surfaces, partic ularly of wood or metal, are prepared for the reception of cellulose varnishes by applying an intermediate coating consisting of a cellulose ester or esters of higher fatty acids, if necessary with addition of colloid hydrocarbon exudations of plants, such as gums, gutta-percha, a resin, rubber, furthermore a colouring agent, a filling agent or the like.

Such an intermediate coating may also be used when several coatings of cellulose varnish are applied. It is known that in the application of more than one coating of cellulose varnish, when a new layer is applied to that previously laid on, the solvent in the varnish swells or partially dissolves the previous coating, even when the latter is com pletely dried. The attempt has been made to overcome this difliculty by selecting for the second coating a varnish the solvent of which has the smallest possible solvent action on the varnish constituting the previous layer. This expedient, however, obviate the disadvantage. The attack of the subsequently applied varnish on the previous layer can, however, be completely excluded by providing between the several layers of varnish of the usual kind, and particularly between the layer, applied by the pallet knife and the first layer an intermediate coating consisting of a solution of acelluloseester of a higher fatty acid or a mixture of such esters, if necessary containing a resin, rubber, a colouring matter, a filling agent or the like. Such intermediate layer or layers are applied in theusual manner.

Examples of solutions suitable for producing intermediate layers according to this invention are as follows I Example 1.-10 parts by weight of cellulose dilaurate and 8 parts of gutta-percha aredissolved in a mixture of 30 parts of benzene, 30 parts of xylene and 22 parts of chlorobenzene. The guttapereha may be omitted'if desired, or there may be substituted for it a IBSHL does not completely lose mono-acetate-distearate and 4 parts of rubber are dissolved in a'mixture of parts of di-chloromethane, 28 parts of chlorobenzene and 10 parts of benzene. The rubber may be omitted if desired or a resin substituted for it.

Upon intermediate layers produced with such solutions any known cellulose varnish varnish layers which may be diiferent in their constitution, fastly combined together and with the base by intermediate layers containing, a cellulose derivative of a higher fatty acid.

In the following claims the ex ression surfaces is intended to'mean sur aces of wood or metal which may be unprepared or coated with a layer applied by a brush or the pallet-knife,

What we claim is 1. A process for preparing surfaces for the reception of cellulose varnishes by applying to the surface an intermediate coating of a solution containing such a cellulosic substance in which at least one OH group of the cellulose molecule is esterified by a'higher fatty acid. l

2. A process for preparing surfaces for the reception of cellulose varnishes by-applying to the surface an intermediate coating of a solution containing such a cellulosic substance in which at least one -OH' group of the cellulose molecule is esterified by a higher fatty acid containing more than 10 carbon atoms.

3. A process for preparing surfaces forthe reception of cellulose varnishes by applying to the surface an intermediate coating of a solution containing such a cellulosic substance in which at least one OH group of the cellulose molecule is esterified by lauric acid. 4. A process for preparing surfaces for the reception of cellulose varnishes by applying to the surface an intermediate coating 0 solution containing cellulose dila-urate.

5. A process for preparing surfaces for the reception of cellulose varnishes by applying to the surface an intermediate coating of a solution containing such a cellulosic substance in which at least one OH group of the cellulose molecule is esterilied by' a higher fatty acid-and a colloid hydrocarbon exudation of plants. 7

6. A process for preparing surfaces for the reception of cellulose varnishes by applying to the surface an intermediate coating of a solution containing cellulose dilaurate and a colloid hydrocarbon exudation of plants.

7. A process for preparing surfaces for the reception of cellulose varnishes by applying to the surface an intermediate coating of a solution containing cellulose dilaurate and guttapercha. v

8. Materials lacquered with cellulose varnish coatings, said coatings covering intermediate layers which contain a cellulose derivative in which at least one OH group of the cellulose molecule is substituted by a higher fatty acid.

9. Materials lacquered with cellulose varnish coatings, said coatings covering inter:

'mediate layers which contain a cellulose derivative in which at least one OH group of thelcellulose molecule is substituted by lauric acic.

10. Materials lacquered with cellulose varnish coatings, said coatings covering inter rnediate layers which contain a cellulose dcrivative in which at least one 'OH group of the cellulose molecule is substituted by a highervfatty acid, and colloid hydrocarbon exudations of plants.

11. Materials lacquered with cellulose varnish coatings, said coatings covering intermediate layers which contain cellulose dilaurate and gutta-percha.

In testimony whereof, we affix our signatures.

ERICH RICHTER. VVALTER BECKEP 

